Is DYNC2I1 p.Arg890= (c.2670A>G) pathogenic?

DYNC2I1 p.Arg890= (c.2670A>G) is classified Likely benign in DYNC2I1 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-09-29). Ultra-rare (popmax 0.0236%, nfe); Associated with short-rib thoracic dysplasia 8 with or without polydactyly.

What condition is associated with DYNC2I1 p.Arg890= (c.2670A>G)?

DYNC2I1 p.Arg890= (c.2670A>G) is associated with short-rib thoracic dysplasia 8 with or without polydactyly (ClinVar).

How common is DYNC2I1 p.Arg890= (c.2670A>G) in the general population?

DYNC2I1 p.Arg890= (c.2670A>G) is ultra-rare (popmax 0.0236%, nfe) (gnomAD).

DYNC2I1 p.Arg890=

c.2670A>G · rs373640802 · VCV710643

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0236%, nfe)

Conditions

short-rib thoracic dysplasia 8 with or without polydactyly

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 0.38	GERP -4.6, phastCons 0.79
Overall
CADD	0.678	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0236% European (non-Finnish) · 277/1,173,598 alleles

Filtering AF 0.0213% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0204%

Overall 0.0182% 291/1,601,346 alleles · ultra-rare exomes 269/1,449,128 · genomes 22/152,218 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0236%	4,237
Remaining individualsnot grpmax-eligible	0.0113%	8,869
African / African-American	0.00535%	18,693
Finnishnot grpmax-eligible	0.00315%	31,704
Admixed American	0.00172%	58,226

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: DYNC2I1
Protein: p.Arg890=
Coding: c.2670A>G
MANE Select: NM_018051
dbSNP: rs373640802
Type: single nucleotide variant
Location: chr7:158934441 (GRCh38)
Gene constraint: LOEUF 0.802 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 62.87 · 4 PDB
Residue 890: a UniProt-annotated variant site (in srtd8; reduces interaction with ift proteins); a UniProt-annotated variant site (in srtd8)

Full DYNC2I1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

short-rib thoracic dysplasia 8 with or without polydactyly — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

DYNC2I1 p.Arg890Gly Uncertain significance ★ same residue
DYNC2I1 p.Arg228Ter Pathogenic/Likely pathogenic ★★ same condition
DYNC2I1 p.Arg441Ter Pathogenic/Likely pathogenic ★★ same condition
DYNC2I1 p.Arg642Ter Pathogenic/Likely pathogenic ★★ same condition
DYNC2I1 p.Arg762Ter Pathogenic ★★ same condition
DYNC2I1 p.Ala157Val Uncertain significance ★★ ⚠ same condition
DYNC2I1 p.Ala609Val Uncertain significance ★★ ⚠ same condition
DYNC2I1 p.Ala800Thr Uncertain significance ★★ ⚠ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/dync2i1-p-arg890 (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown